Electric detonator



' H.-L. GRANT AND HADDOW.

ELECTRIC DETo'NAToR. APPLICATION FILED MAY 20, 1920.

Patented Sept. 528, 1920.

E v IN VEN TORS.

UNITED STATES PATENT OFFICE.

:LARRY L. GRANT AND GEORGE PIADDOW, oF TAMAQUA, PENNSYLVANIA, AssIGNoRs To ATLAS POWDERv COMPANY,l or PHILADELPHIA, PENNSYLVANIA, A' CORPORA- .TION OE DELAWARE. f

ELECTRIC DETONATOR. i

T o all whom t may concern Be it known that we, HARRY L. GRANT l and GEORGE HADDow, citizens of the United States of America and Great Britain, re spectively, residing at Tamaqua, in the county of Schuylkill and State of Pennsyl- Vania, have invented certain new and useful Improvements in Electric DetonatorDs, of which the following is a specication.

The object of the present invention is to provide an electric detonator of the character of that shown in United States Patent No. 720,073, but embodying certain' improvement features not disclosed by said patent, and hereinafter more particularly pointed out. Y

Among the objects ofthe invention is to provide an adapter, within which the fuse Wire and a priming element are united in such manner as to thereafter prevent separation of the parts, said adapter acting as an insulator.

'A further object of the invention is to provide in a device of this character, an

adapter of a nature to be used in place of the usual sulfur plug, ordinarily employed, so thatoa cavity of much greater size than usual is left in the shell, for the reception of aiilling material which renders the assembly entirely waterproof.

Further objects and advantages of the invention will be set forth in the detailed description which now follows.

In the accompanying drawing:

Figure 1 is a longitudinal sectional view of a detonator constructed in accordance with the invention; and

Fig. 2 is an enlarged sectional view of the adapter.

Like numerals designate corresponding parts in both of the figures of the drawing.

In carrying out the invention we provide an adapter consisting of a bodytportion of inverted cup shape, indicated at 5, said body portion being of a highly. dielectric material, such as hard rubber, fiber, or the like. The body 5 is formed with an internal cavity 6, the latter communicating with a passage 7 that leads axially through the adapter. Grooves 8 and 9 located upon Opposite sides of the passage 7, communicate with said passage and preferably, though not necessarily, terminate at shoulders 10: The grooves 8 are for the reception of 4the Application mea' may zo, 1920. serial No. 382,979.

Specification of Letters'laten't. Patented Sept. 28, 1920.

terminal ends of th'e fuse wires 11 and 12, said fuse wires'being to the opposite faces of a strip 15, which passes through the passage 7 and carries at its lower endv a globule 16 of a primer composltion. This element is similar to that shown and Ildescribed in the Patent 720,073, above referred to, which element has its opposite faces coated with conductive material so that the primercomposit1on may be fired through the medium of an electric current carried by the wires 11 and 12.

In assembling the parts so far described, the strip l5 is passed through the passage 7, with the globule 16 lying within the cavity 6. The ends of the wires 11 and 12 are then inserted in grooves 8\and 9 and are soldered to the strip as heretofore stated. Thus it will be seen that during the soldering operation, the globule 16 is located in a protected position within the cavity 6 so that danger of ignition of the same is avoided. After the solder has been placed inposition, all of the parts will be securely tied together, because the globule 16 `is too large to pass through\the passage 7 and downward movement of the wires is resisted by the abutment of the lower end thereof against the shoulders 10. However, these shoulders may be omitted if desired and the presence of the drops of solder may be relied upon to prevent downward movement of the wines. The adapter being of insulating material, not only acts to isolate oppositely charged leading wires, but holds the priming element and the wires in assembled relation, during the soldering operation; materially facilitating the latter. The adapter protects the priming composition from being accidentally broken or torn away, and prevents spreading of the fuse Wires or the stem ofthe priming device. The body 5 is beveled Vas indicated at 17, the purpose of which will be presently stated.

Invuse the adapter is inserted in the interior of the shell 18 of a detonator its lower soldered at 13 and 111' end resting upon the detonating composition 19, after which the shell 18 is filled with a sealing composition 20, of a nat-ure to render the entire assembly waterproof. The tapering of the body 5, at 17 permits the waterproofing material to extend down the sides of the body 5 to a point materially below the level of the top thereof, thereby 4rendering the waterproofing more perfect.

The provision of' the cavity 6 not onlyv serves -the useful purposes heretofore set forth but aids in the generation of an effective flashr of the primer composition.

It is to be understood that the invention is not limited t0 the Vprecise constructionpset forth but that yit includes Within its purview whatever changes fairly come within either the terms or the spirit of the append-- ed claims. Y

described our-invention,`what we 1. AIn a device ofthe vcharacter described an adapter formed yof insulating material ders, said wires dbeing united to said strip,

e wlres and a head of primer composition upon said strip within the underside cavity, of such size as to prevent endwisemovement of the strip through said passage.

2. Axdetonator comprising a shell and a body of detonating material therein, an adapter formed of insulating material of a diameter at its lower portion to substantially fill said shell, said adapter having an underside cavity and beingy tapered at its upper portion, a primer comprising a strip and a head of primer com osition, said head being located'within sai cavity and said strip extending through an axial opening formed in said4 adapter, fuse wires connected to thestrip above the adapter and a seal- Iing;material filling the shell above the adapter and extending downwardly into the shell about the tapered upper Lportion of thek adapter. A

In testimony whereof We aiix our signatures in the presence of two witnesses.

HARRY L. GRANT. GEORGE HADDOW. L

Witnesses: I d f SAML. R. BEARD, HARRY LINKER. 

